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8758573 Removal of hydrocarbons from an aqueous stream  
The present application concerns a process for the removal of hydrocarbons from an aqueous stream, which process may include conducting a phenol-containing water stream into a separation column,...
8231765 Process for the purification of lactams  
A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis...
7501047 Method for purifying caprolactam  
The disclosure relates to a process for purifying crude caprolactam. The process involves converting a first mixture of 6-amino capronitrile and water to a second mixture of caprolactam ammonia,...
7481878 Activated clays from oil contaminated drill cuttings  
A method for the preparation of activated clays and cement additives from contaminated drill cuttings is provided. The substrate can be mixed with a mineral acid in a first reactor. The acidified...
7384518 Method for purifying lactams  
A method and a plant are disclosed for purifying lactams, particularly lactams obtained by cyclizing hydrolysis of aminonitrile. The purification of ε-caprolactam obtained by cyclizing hydrolysis...
7175819 Regeneration of cupric etchants and recovery of copper sulfate  
Spent, acidic solutions comprising cupric chloride and hyrdrochloric acid from the copper etching process are regenerated by a process in which the acid is subjected to distillation with sulfuric...
7074304 Process for purifying alicyclic alcohols  
A process for purifying alicyclic alcohols by distillation, wherein the alicyclic alcohols are distilled in the presence of from 1 to 550 ppm of acidic compounds.
6825379 Method for recovering and producing C4-C6 dicarboxylate from alkaline waste solution generated in caprolactam preparation process  
The present invention relates to a method for recovering and producing C4-C6 dicarboxylates from an alkaline waste solution generated in a caprolactam preparation process, in which the alkaline...
6638398 Methods for the evaporation of an aqueous solution containing ammonia  
A method including evaporating aqueous solutions containing ammonia, adding an acid to the evaporated vapor flow to form an ammonium salt, and condensing the vapor flow to form a liquid containing...
6488818 Removal of impurities from 3-(2′-acetoxyethyl)-dihydro-2(3H)furanone  
A process for removing impurities from 3-(2′-acetoxyethyl)dihydro-2(3H)furanone (I), where the 3-(2′-acetoxyethyl)dihydro-2(3H)furanone containing the undesirable impurities is initially prepared...
6464838 Process for the recovery of compounds present in the heavy products after their preparation  
A process for the recovery of compounds present in a mixture containing residues of heavy products is provided. The process includes conducting a reaction and distillation to obtain the compounds...
6375808 Process for producing difluoromethane  
A process for refining difluoromethane by removing hydrogen fluoride, which is contained in difluoromethane difficult to remove. The process involves distilling a mixture of difluoromethane with...
6111096 Nucleic acid isolation and purification  
The invention is based on the discovery that hyperbaric, hydrostatic pressure reversibly alters the partitioning of nucleic acids between certain adsorbed and solvated phases relative to...
5989394 Process for treatment of a contaminated liquid  
A process for purification treatment of an impure liquid, such as a contaminated condensate, obtained when producing paper or paper pulp. The liquid is introduced intro a stripper device at an...
5700358 Recovery of caprolactam from oligomers and/or polymers of caprolactam  
Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained...
5693190 Recovery of glycols from used antifreeze compositions by distillation  
A method for the recovery of glycols from used antifreeze compositions by distillation entails the used antifreeze composition being treated before and/or during its distillation with an effective...
5632866 Point-of-use recycling of wafer cleaning substances  
A method of recycling and purifying cleaning chemicals used in the production of semiconductor circuits and containing hydrofluoric acid and or hydrochloric acid. Recycling of such chemicals is...
5620567 Process for the removal of aldehydes and acetals from industrially prepared acetic acid  
A process for the removal of aldehydes and acetals from industrially prepared acetic acid, wherein the contaminated acetic acid is reacted in the presence of a Bronstedt acid and 0.05 to 1% by...
5589037 Method for removing tetranitromethane from nitric acid  
Tetranitromethane and other polynitrated methanes can be effectively removed from otherwise substantially organic-free nitric acid streams through the addition of substantially organic-free...
5587056 Separation of aliphatic diacids from adipic acid admixtures thereof  
At least a fraction of at least one branched, saturated aliphatic diacid having 6 carbon atoms, for example 2-methylglutaric acid and/or 2-ethylsuccinic acid and/or dimethylsuccinic acid, is...
5536376 Method for production of 2-chloropyridine and 2,6-dichloropyridine  
A method for producing 2-chloropyridine and 2,6-dichloropyridine by the steps of mixing vaporized chlorine and vaporized water to obtain dilute chlorine; introducing the dilute chlorine and...
5516406 Process for purifying acids formed during liquid phase oxidation of butane  
A method of purifying the oxidate product formed by the liquid phase oxidation of C4 -C8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the...
5512691 Process for the production of tocopherol concentrates  
Disclosed is an improved process for the preparation of tocopherol concentrates from vegetable oil distillates. Tocopherol concentrates are obtained containing 20-80% tocopherol by weight, with an...
5500098 Process for regeneration of volatile acids  
Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid...
5458740 Process for the purification of crude caprolactam  
A process for the purification of caprolactam from crude caprolactam by distilling the crude caprolactam in the presence of an anorganic or organic acid.
5240566 Separation process  
A process for separating acetone, dichloromethane and trifluoroacetic acid from a mixture of acetone, dichloromethane, and a trifluoroacetic acid/acetone azeotropeby (1) fractionally distilling...
5236557 Process for purification of aqueous solutions containing hydrogen sulfide, hydrogen cyanide, and ammonia  
Aqueous solutions which are contaminated by hydrogen sulfide, hydrogen cyanide, and ammonia are brought to a pH of about 3 or less after their formation and treated with an inert gas in a...
5227028 Process for treating amides  
A process of treating a ketoxime or aldoxime-containing amide mixture resulting from a Beckmann rearrangement of the corresponding ketoxime or aldoxime. The process involves hydrolysis of the...
5160413 Micro-distillation process for cyanide  
Micro-distillation apparatus is provided for analyzing acidic anions in which the acidic anion sample is placed in a lower elongated member in water containing an acidifying material, upon heating...
5158651 Process of centrifugally removing inorganic compounds from polyester glycol recovery bottoms  
A process for removing inorganic compounds from glycol recovery still bottoms resulting from the manufacture of poly(ethylene terephthalate), the novel process using a small amount of phosphoric...
5094720 Process for the distillative purification of citral  
A method is disclosed for enhancing the purification of citral by fractional distillation by inhibiting the formation of isocitrals from isomerization of citral during the distillation process....
5064507 Distillation process for recovery of high purity phenol  
High purity phenol is obtained from cleavage of cumene hydroperoxide by treating the crude phenol product stream in a first treatment zone with an amine, a coarse distillation to obtain an...
5004829 Method of preparing trifluoromethanesulfonic acid anhydride  
(CF3 SO2)2 O is formed by reaction of CF3 SO3 H with P2 O5 and taken out of the reaction system by distillation, but the residue of the distillation contains a considerable amount of unreacted CF3...
4966276 Processes for concentrating nitric acid  
An integrated continuous processes for concentrating "weak" nitric acid and concurrently reconcentrating the spent dehydrating agent used to break the nitric acid azeotrope to obtain "strong"...
4956157 Process for separating salts in seawater  
A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by...
4946029 Purification of carboxylic esters which contain aldehydes, acetals and/or unsaturated compounds  
Carboxylic esters obtained by reacting olefinically unsaturated compounds with carbon monoxide and alcohols and containing aldehydes, acetals and/or unsaturated compounds are purified by (a)...
4944848 Process for the purification of 1,1-diphenylethane with good fragrance quality  
A process for the purification of 1,1-diphenylethane with good fragrance quality. The product is produced by first subjecting the distillation residue from ethylbenzene production to distillation,...
4939294 Preparation of ultra high purity methyl acetate  
In a process for the production of methyl acetate from methanol and glacial acetic acid involving countercurrently flowing acetic acid and methanol through a single reactive distillation column...
4915794 Process for converting internal olefins to alpha olefins  
This invention relates to a process for producing an olefin product having an enhanced alpha olefin content from an olefin feedstock containing internal olefins or a mixture of internal and alpha...
4851085 Purification of butyrolactone  
A process which comprises treating butyrolactone in at least 95% purity with an acid to convert and remove color forming impurities for product stabilization.
4830712 Process for refining ethylene glycol  
A process is described for recovering polyester-grade ethylene glycol from crude ethylene glycol containing at least one component which has a normal boiling point below that of ethylene glycol,...
4737243 Method for decoloration of triethylenetetramine (TETA)  
A method of removing color from crude triethylenetetramine (TETA) is disclosed. In the preferred procedure, acid treated clay or acidic form zeolite are mixed with the TETA at elevated...
4720328 Method for removing impurities from caprolactam  
A method for removing impurities from caprolactam is disclosed. The method comprises the sequential steps of treating the impure caprolactam with phosphorus pentoxide so that the impurities react...
4435595 Reactive distillation process for the production of methyl acetate  
The present invention provides a process for the production of high purity methyl acetate from methanol and glacial acetic acid wherein the acetic acid functions both as a reactant and as an...
4434301 Production of low color refined isophorone  
Crude isophorone is refined by contacting it with aqueous caustic followed by washing and fractional distillation.
4395311 Preparation of aminomethanols  
Crude aminomethanols are converted to salt form by the addition of a strong acid and subsequently distilled under vacuum. The resulting purified aminomethanol is essentially free of unreacted...
4388154 Isolation of acetaldehyde and methanol from reaction mixtures resulting from the homologization of methanol  
A process is provided wherein acetaldehyde and methanol are obtained from reaction mixtures which result from the homologization of methanol and which in addition to acetaldehyde essentially...
4383893 Distillative separation of liquid mixtures containing aliphatic alcohols  
Liquid mixtures containing aliphatic alcohols are separated, by distillation, into a higher-boiling alcohol-containing fraction and a lower-boiling fraction containing the other liquids, by...
4350572 Purification of carboxylic acid esters containing aldehydes and/or acetals  
A process for purifying carboxylic acid esters which have been obtained by reacting olefinically unsaturated compounds with carbon monoxide and alkanols and which contain aldehydes or acetals,...
4336109 Method for the recovery of acetone  
Acetone having a markedly low content of aldehydes is recovered from an aqueous rectification residue brought about by rectification of crude acetone carried out after one crude acetone having...

Matches 1 - 50 out of 126 1 2 3 >